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<br />r <br />; <br />, <br />i <br />! <br />f <br />, <br /> <br />- <br /> <br />. <br /> <br />If non-zero, the minor code which follows is a parameter requ1r1ng <br />special interpretation according to instructions given in the codes <br />for each category. <br /> <br />Minor Attribute Codes <br /> <br />The first digit of the minor code is normally zero. If non-zero, it is used as <br />a modifier to provide additional information. The remaining three digits are <br />normally used to indicate the cart:ographic interpretation t:o be applied t:o <br />specific elements. The t:ype of element: described by a particular code usually <br />can be determined from t:he range of value of the last t:hree digits: <br /> <br />001 - 099 <br />100 199 <br />200 299 <br />300 399 <br />400 499 <br /> <br />- nodes <br />areas <br />lines <br />degenerate lines <br />c~des which may be applied to any <br />(nodes, lines, areas, or points) <br />- general descriptive codes <br /> <br />. <br />element type <br />\ <br /> <br />601 - 699 <br /> <br />.n <br /> <br />The last: three digit:s (and occasionally all four digits) also may be used as a <br />parameter code. Parameters are used when a minor code can legitimately assume <br />a range of values, such as a water elevation. The meaning of a parameter code <br />is indicat:ed by t:he (non-zero) t:hird digit: of the major code. <br /> <br />Specifications <br /> <br />Specifications <br />subj ect areas: <br />format. <br /> <br />for OLG dat:a will be described by considering the following <br />coordinate syst:ems, cell size and ext:ent, and dist:ribution <br /> <br />Coordinate Systems <br /> <br />The OLG dat:a published by FEMA are expressed in the units of the respective <br />ground coordinate systems: that is, meters in the Universal Transverse Mercator <br />(UTM) system. <br /> <br />Cell Size and File Extent <br /> <br />In general the OLGs are stored and distributed in standard cells of 7.S-minutes <br />of latitude by 7.S-minutes of longitude. Non-standard quadrangles which have a <br />neatline extended to accommodate overedge information, (e. g. along national <br />boundaries or in coastal areas) are collected as multiple 7.S-minute units (see <br />Appendix E for over edge naming conventions). In Alaska, OLGs are stored in cells <br />varying from lO-minutes to IS-minutes of longitude, by 7.S-minutes of latitude, <br />depending on the latitude of the cell. <br /> <br />10/93 <br /> <br />S <br />